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We prepared three ferrite nanocatalysts: (i) copper ferrite (CuFe2O4), (ii)ferrite where cobalt was substituted by nickel (NixCo1-xFe2O4, with x= 0, 0.2,0.4, 0.6), and (iii) ferrite where nickel was substituted by zinc(ZnyNi1-yFe2O4 with y= 1, 0.7, 0.5, 0.3), by the sol-gel method. The X-raydiffraction patterns show that the ferrite samples have been crystallized inthe cubic spinel structural phase. We obtained the grain size by FE-SEM imagesin the range of 10-70 nm, and their magnetic properties by VSM. Next, carbonnanotubes were grown on these nanocatalysts by the CCVD method. We show thatthe catalytic effects of these nanocrystals on the carbon nanotube growthdepend on cation distributions in the octahedral and tetrahedral sites,structural isotropy and catalytic power due to cations. Our study can haveapplications in finding a suitable candidate of doped ferrite nanocrystals ascatalysts for carbon nanotube growth. More interestingly, the yield of thefabrication of carbon nanotubes can be considered as an indirect tool to studycatalytic activity of ferrites.

Catalytic effect of the spinel ferrite nanocrystals on the growth of carbon nanotubes